Could that 'altercation' not be the alleged racist abuse of the mother?
Sure it will be ... and may then have had a knock-on effect with other 'alleged' aspects e.g. the police requiring that the mother unveil etc for identification - which isn't unreasonable from a legal perspective (but possibly difficult from a cultural one) - she was a primary figure in the first altercation (on plane etc) - and also the second in the parking area before the police arrived - lot of it conjecture, but it's clear that a lot went on before it all blew up with the punch-up and kicking incident ...
